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Method and system for treating lead and zinc waste materials

A waste, lead-zinc technology, applied in the field of metallurgy, can solve problems such as high mineral dispersion, unsmooth production, and material reflow, and achieve the effects of reducing reduction temperature, reducing processing costs, and reducing external allocation

Inactive Publication Date: 2016-11-09
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc leaching slag is used alone for reduction and volatilization. Due to the fine particle size of zinc slag and high degree of mineral dispersion, a high reduction temperature is required to achieve rapid aggregation and growth of iron, and a high reduction temperature is likely to cause material reflow, resulting in production Not going well
[0005] Therefore, the existing technology for processing two lead-zinc wastes containing lead-zinc kiln slag and zinc leaching slag needs to be further improved

Method used

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  • Method and system for treating lead and zinc waste materials
  • Method and system for treating lead and zinc waste materials
  • Method and system for treating lead and zinc waste materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] The iron content in the lead-containing zinc kiln slag is 28wt%, the MFe content is 12wt%, the C content is 15wt%, and the Zn content is 1.5wt%. The zinc content in the zinc leaching slag is 16wt%, and the iron content is 22wt%. t. Dry the kiln slag until the water content does not exceed 4wt%, then crush and grind the obtained kiln slag to a particle size of 30 μm, accounting for 95%, and dry the zinc leaching slag until the water content is lower than 5wt%, and the obtained kiln The slag fines and zinc leached slag dry material are mixed with bentonite, wherein, based on 100 parts of kiln slag fine material, mixed with 42 parts of zinc leached slag dry material, 3 parts of bentonite, and mixed and ground in the moistening equipment , and then adjust the water content of the obtained mixture and send it to the roller briquetting machine to obtain mixed pellets, and dry the pellets until the moisture content is <2%, and then send them to the rotary hearth furnace for re...

Embodiment 2

[0090] The iron content in the lead-containing zinc kiln slag is 28wt%, the MFe content is 12wt%, the C content is 15wt%, and the Zn content is 1.5wt%. The zinc content in the zinc leaching slag is 16wt%, and the iron content is 22wt%. t. Dry the kiln slag until the water content does not exceed 5wt%, then crush and grind the obtained kiln slag to a particle size of 30 μm and account for 95%, dry the zinc leaching slag until the water content is lower than 5wt%, and then the obtained kiln The slag fines and zinc leaching slag dry material are mixed with anthracite and bentonite, wherein, based on 100 parts of kiln slag fine material, 42 parts of zinc leaching slag dry material are mixed, 6 parts of reducing agent are added, and 3 parts of bentonite are added. Mix and grind in the grinding equipment, then adjust the moisture content of the obtained mixture and send it to the double-roller briquetting machine to obtain mixed pellets, and dry the pellets until the moisture conten...

Embodiment 3

[0092] The iron content in the lead-containing zinc kiln slag is 28wt%, the MFe content is 12wt%, the C content is 15wt%, and the Zn content is 1.5wt%. The zinc content in the zinc leaching slag is 16wt%, and the iron content is 22wt%. t. Dry the kiln slag until the water content does not exceed 3wt%, then crush and grind the obtained kiln slag to a particle size of 30 μm and account for 95%, dry the zinc leaching slag until the water content is lower than 3wt%, and then the obtained kiln The slag fines and zinc leaching slag dry material are mixed with bentonite, wherein, based on 100 parts of kiln slag fine material, 25 parts of zinc leaching slag dry material are mixed, 3 parts of bentonite are added, and they are mixed and ground in the moistening equipment , and then adjust the water content of the obtained mixture and send it to the double-roller briquetting machine to obtain mixed pellets, and dry the pellets until the moisture content is <2%, and then send them to the ...

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Abstract

The invention discloses a method and a system for treating lead and zinc waste materials. The method comprises the steps of (1) drying lead and zinc containing kiln slags; (2) grinding dried kiln slags; (3) drying zinc leaching slags; (4) mixing fine kiln slags, dry zinc leaching slags, reducing agents and binders; (5) pelletizing a mixture, so as to obtain mixed pellets; (6) supplying the mixed pellets to a feed area of a rotary hearth furnace, so that the mixed pellets pass through a preheating area and a high-temperature area of the rotary hearth furnace in sequence for reduction, obtained smoke which contains indium oxide, zinc oxide and lead oxide is discharged from the preheating area, and obtained metallized pellets are discharged from a discharging area; (7) performing ore grinding and magnetic separation on the metallized pellets, so as to obtain metal iron powder and tailings. According to the method, the comprehensive recovery and utilization of carbon, iron, lead, zinc and indium in the zinc leaching slags and the lead and zinc containing kiln slags can be realized, the volatilization rate of lead, zinc and indium can reach more than 98%, and the recovery rate of iron can reach more than 90%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method and a system for processing lead and zinc waste. Background technique [0002] In the conventional zinc hydrometallurgy process, almost all of the lead, gold, silver, indium and 15% of the zinc in the calcined sand go into the leaching slag. About 1.05 tons of leaching slag are produced for every ton of electric zinc produced. Rotary kiln volatilization is one of the most important process methods for treating zinc leaching slag, and it is most widely used in my country's wet zinc smelting plants. The yield of kiln slag is 64% to 68% of that of leaching slag. According to the actual production statistics, about 0.8t of kiln slag is produced for every lt of electrolytic zinc produced. At present, the accumulative total of kiln slag stacked in the slag yard in my country has reached more than 10 million tons, which not only increases the cost of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/243C22B1/00C22B7/04C22B13/02C22B19/30C22B58/00
CPCC22B1/00C22B1/242C22B1/243C22B7/001C22B7/04C22B13/025C22B19/30C22B58/00Y02P10/20
Inventor 吴道洪古明远王敏吴佩佩曹志成薛逊
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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